[llvm] [llvm-debuginfo-analyzer] Apply various memory savings in Core/LVxxx base classes (PR #144399)

[Javier Lopez-Gomez via llvm-commits]

jalopezg-git wrote:

> > @CarlosAlbertoEnciso FYI 🙂. Feel free to review / leave comments.
> > Also, could you measure peak memory usage (both, before and after this change) for the Chrome debug info case?
> 
> I am preparing some memory usage data before/after for Chrome.

Thank you :+1:!

https://github.com/llvm/llvm-project/pull/144399